JPH09312084A - Information recording device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the compatibility and reliability of information. SOLUTION: An information recording carrier 1 capable of being attached to and detached from the device holds a historic information indicating the device which has applied the last recording action to the own identifier and its carrier. An information transfer judging circuit 5 judges whether the information transfer to the carrier has finished or not and a history judging circuit 6 judges whether the carrier 1 has been the subject of transfer before interrupting the power source or not. When it is judged that the information transfer is unfinished and the carrier was a subject of transfer before the interruption of the power source, the information of non-volatile memory 8 is written into the carrier 1. By this, even when an interruption of the power source causes untransferred information to occur, the consistency and reliability of information is obtained by retransfering the information to the carrier to be recorded after the power source is turned on again.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an information recording device for recording / reproducing information on / from a removable information record carrier.

[0002]

2. Description of the Related Art Conventionally, information recording devices such as magnetic disk devices have been known, and some of these devices have a function of temporarily storing information. In this information recording apparatus, even if the power is suddenly cut off during the recording operation, the information being recorded is retained so that the information retained after the power is turned on can be written to the information record carrier. . By the way, regarding the information recording carrier that can be attached to and detached from the information recording device, the carrier that is mounted when the power is turned on again is not necessarily the same as the carrier that was mounted before the power was turned off. . However, the conventional information recording apparatus has no means for confirming whether or not the carrier is the same, and if the held information is written without confirming the carrier, the information is written on a carrier different from the carrier to be originally recorded. It is possible.

[0003]

As described above, in the information recording apparatus for recording / reproducing information on / from the removable information recording carrier, the mounted carrier is turned off when the power is turned on again. Since it is not always the same as the mounted carrier, it is difficult to transfer the information that could not be transferred due to the power off to the carrier to be recorded after the power is turned on again to make the information consistent, There is a problem that reliability cannot be obtained because information may be accidentally written on another carrier. The present invention has been made to solve the above problems, and an object of the present invention is to improve the consistency and reliability of information in an information recording apparatus that records and reproduces information on a removable information record carrier.

[0004]

According to the present invention, a nonvolatile storage means for holding information to be transferred to an information record carrier which can be attached to and detached from a device even when the power is cut off, and information transfer to the carrier is completed. Information transfer determining means for determining whether or not the carrier currently mounted is a carrier for determining whether or not the currently mounted carrier is a carrier to be transferred before the power is cut off, and information transfer to the carrier is not completed, In addition, when it is determined that the mounted carrier is the carrier to be transferred before the power is turned off, the writing means writes the information held in the nonvolatile storage means into the carrier. By thus providing the nonvolatile storage means, the information transfer determination means, the history determination means, and the writing means, the information transfer to the carrier is not completed, and the mounted carrier is the transfer target before the power is turned off. When it is determined that the carrier is the existing carrier, the information held in the nonvolatile storage means is written in the carrier.

Further, the information recording medium has a reading means for reading information from the information recording medium, and the information recording medium is written with a unique identifier and history information indicating the information recording device which performed the last recording operation on the medium. The history determining means makes a determination based on the identifier and the history information read by the reading means from the carrier, and the writing means updates the history information held by the carrier after writing the information on the carrier. To do.

[0006]

1 is a block diagram of an information recording apparatus showing a first embodiment of the present invention, and FIG. 2 is a flow chart showing the operation of the information recording apparatus. In FIG. 1, 1 is an information recording carrier such as a magneto-optical disk, 2 is an information recording device (magneto-optical disk drive device), 3 is an optical head, 4 is a reading circuit for reading information from the carrier 1, 5
Is an information transfer determination circuit for determining whether or not the information transfer to the carrier 1 is completed.

Further, 6 is a history judgment circuit for judging whether the currently mounted carrier 1 is the carrier to be transferred before the power is cut off, and 7 is a temporary information when the information is exchanged with the carrier 1. Cache memory for storing
Reference numeral 8 is a non-volatile memory that holds information even when the power is cut off, 9 is a writing circuit for writing information on the carrier 1, 1
Reference numeral 0 is a control circuit for controlling the entire information recording apparatus.

Next, the operation of the information recording apparatus 2 after the power is turned on again will be described. First, when the information recording apparatus 2 is powered on (step 101 in FIG. 2), the control circuit 10
Determines whether the information record carrier 1 is mounted (step 102). Then, when the information recording carrier 1 is mounted, the control circuit 10 causes the information to be read from this carrier 1 (step 103). That is, the optical head 3
The carrier 1 is irradiated with laser light from the carrier to detect the reflected light from the carrier 1 with the optical head 3, and the optical head 3 thus obtained is obtained.
The read circuit 4 demodulates the signal from the carrier 1 so that the carrier 1
Information can be read from.

Here, the information recording carrier 1 is written with an identifier unique to it and history information indicating the information recording device that performed the recording operation last on the carrier 1, and the first reading when the power is turned on. Then, this information is read. Subsequently, the information transfer determination circuit 5 determines whether or not the information transfer from the cache memory 7 to the carrier 1 was completed when the power was cut off (step 104).

This judgment is made based on whether or not information remains in the non-volatile memory 8. That is, the information written in the non-volatile memory 8 is erased after the transfer to the carrier 1 is completed as described later. Therefore, when the information remains in the memory 8, it is determined that the transfer is not completed and the information remains. If not, it is judged that the transfer is completed. If it is determined that the transfer has been completed, the process proceeds to step 110, and normal operation (operation according to an instruction from a host computer not shown) is performed.

When it is judged that the transfer is not completed because the information remains in the non-volatile memory 8, the history judgment circuit 6 stores the identifier read from the carrier 1 and the power supply stored in the memory 8 before power-off. Finally, the identifier of the carrier that was the transfer target is compared (step 105). If the identifiers do not match, it is determined that the carrier is not the one mounted when the power is turned off, and the process proceeds to step 110.

When the identifiers match, the history determination circuit 6 determines whether or not the recording operation by another device is performed from the power-off to the present, based on the history information read from the carrier 1. Judge (Step 10
6). At this time, when the history information indicates that the information recording device that last performed the recording operation on the carrier 1 is another device, the recording operation by the other device is performed from the power-off to the present. I have received it, so step 11
Go to 0.

When the history information indicates that the information recording device that has performed the recording operation on the carrier 1 last is the device itself, the control circuit 10 causes the information recording carrier 1 to write the information (step 107). . That is, the nonvolatile memory 8
The information remaining in the cache memory 7 is transferred to the cache memory 7, this information is converted into a recording signal by the writing circuit 9, and the laser light based on the recording signal is emitted from the optical head 3 to the carrier 1, whereby the information is recorded. Written on carrier 1.

After the transfer of this information, the control circuit 10 updates the history information written in the carrier 1 to the information indicating that the own device has performed the recording operation (step 108). This update process is performed in the same manner as the above-mentioned write operation. Further, the control circuit 10 erases the information remaining in the cache memory 7 and the non-volatile memory 8, and
The identifier of the carrier 1 as the carrier to be transferred is written in the non-volatile memory 8 (step 109).

As described above, in the present embodiment, the information transfer determination circuit 5 determines that the information transfer to the carrier has not been completed,
The history is determined that the identifier read from the carrier 1 matches the identifier of the carrier that was the last transfer target before power-off, and that the carrier 1 has not been subjected to recording operation by another device from power-off to the present. When the circuit 6 makes the determination, the information remaining in the non-volatile memory 8 is written to the carrier 1.

Therefore, even if untransferred information is generated due to the interruption of the power supply, the consistency of the information can be obtained by transferring the information to the carrier to be originally recorded after the power is turned on again, and the information is erroneously transferred to another carrier. Since the information is never written, the reliability can be improved.

When the write operation is performed in step 110, the information transferred from the host computer to the cache memory 7 is sent to and stored in the non-volatile memory 8. At the same time, this information is converted into a recording signal by the writing circuit 9, and laser light based on the recording signal is applied to the carrier 1 from the optical head 3 to write the information on the carrier 1.

Then, the history information written in the carrier 1 is updated as in step 108, the information remaining in the memories 7 and 8 is erased and the identifier of the carrier 1 is written in the memory 8 as in step 109. As a result, the operation after the power is turned on again can be realized. Although the cache memory 7 and the non-volatile memory 8 are separately provided in the present embodiment, a non-volatile memory may be used as the cache memory 7 itself so that the cache memory 7 also serves as the memory 8. Further, in the present embodiment, the magneto-optical disk is described as an example of the information recording carrier 1, but it goes without saying that another carrier such as a magnetic disk may be used.

[0019]

According to the present invention, the nonvolatile storage means, the information transfer determination means, the history determination means, and the writing means are provided, and the information transfer to the carrier is not completed and the mounted carrier is the power source. When it is determined that the carrier was the transfer target before shutting off, by writing the information held in the non-volatile storage means to the carrier, even if untransferred information occurs due to sudden power shutoff, the power is restored. Information consistency can be obtained by transferring again to the carrier to be originally recorded after the input. Further, since the information is not accidentally written on another carrier, the reliability can be improved.

Further, the information recording carrier holds the unique identifier and the history information, and the writing unit writes the information on the carrier and then updates the history information held by the carrier, whereby the judgment by the history judging unit is facilitated. Can be done.

[Brief description of drawings]

FIG. 1 is a block diagram of an information recording apparatus showing a first embodiment of the present invention.

FIG. 2 is a flowchart showing the operation of the information recording device of FIG.

[Explanation of symbols]

1 ... Information recording carrier, 2 ... Information recording device, 3 ... Optical head,
4 ... Read circuit, 5 ... Information transfer determination circuit, 6 ... History determination circuit, 7 ... Cache memory, 8 ... Non-volatile memory, 9 ...
Writing circuit, 10 ... Control circuit.

Claims (2)

[Claims] 1. A non-volatile storage means for holding information to be transferred to a removable information record carrier from the device even when the power is turned off, and determining whether or not the information transfer to the information record carrier is completed. Information transfer determining means, history determining means for determining whether the currently mounted carrier is the carrier that was the transfer target before the power is turned off, and the information transfer to the carrier has not been completed and is mounted. An information recording apparatus comprising: a writing unit that writes information held in a non-volatile storage unit to a carrier when it is determined that the carrier is a carrier to be transferred before the power is turned off. 2. The information recording apparatus according to claim 1, further comprising a reading unit for reading information from the information recording carrier, wherein the information recording carrier has a unique identifier and a recording operation last performed on the carrier. The history information indicating the information recording device is written, and the history determination means makes the determination based on the identifier and the history information read by the reading means from the carrier, and the writing means, An information recording apparatus for updating history information held by a carrier after writing information on the carrier.